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The W. M. Keck Observatory infrared vortex coronagraph and a first image of HIP79124 B
Jet Propulsion Laboratory (NASA), USA.
Université de Liège, Belgium.
California Institute of Technology, USA.
California Institute of Technology, USA.
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2017 (English)In: Astronomical Journal, ISSN 0004-6256, E-ISSN 1538-3881, Vol. 153, no 1, 1-7 p., 43Article in journal (Refereed) Published
Abstract [en]

An optical vortex coronagraph has been implemented within the NIRC2 camera on the Keck II telescope and used to carry out on-sky tests and observations. The development of this new L′-band observational mode is described, and an initial demonstration of the new capability is presented: a resolved image of the low-mass companion to HIP 79124, which had previously been detected by means of interferometry. With HIP 79124 B at a projected separation of 186.5 mas, both the small inner working angle of the vortex coronagraph and the related imaging improvements were crucial in imaging this close companion directly. Due to higher Strehl ratios and more relaxed contrasts in L′ band versus H band, this new coronagraphic capability will enable high-contrast, small-angle observations of nearby young exoplanets and disks on a par with those of shorter-wavelength extreme adaptive optics coronagraphs.

Place, publisher, year, edition, pages
2017. Vol. 153, no 1, 1-7 p., 43
Keyword [en]
instrumentation: adaptive optics
National Category
Engineering and Technology Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-311385DOI: 10.3847/1538-3881/153/1/43ISI: 000405784300001OAI: oai:DiVA.org:uu-311385DiVA: diva2:1059927
Funder
EU, FP7, Seventh Framework Programme, 337569Swedish Research Council, 621-2014-5959
Available from: 2016-12-26 Created: 2016-12-26 Last updated: 2017-10-24Bibliographically approved

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Karlsson, MikaelForsberg, PontusPiron, PierreVargas Catalan, Ernesto

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